A coaxial dielectric barrier discharge plasma-assisted combustion actuator (DBD-PACA) system was set up to study its discharge\nand optical emission spectrum (OES) characteristics in space in this paper. Results showed that each discharge cycle can be divided\ninto four stages: a, b, c, and d. Discharge-on only occurred in stages b and d. Comparatively, the discharge intensity was larger in\nstage d due to the memory effect of excited electrons. Moreover, Lissajous figure and current-voltage methods were utilized to\ncalculate the power of the coaxial DBD-PACA, and both methods produced roughly similar results. The power presented an\nupward trend with increasing input voltage and airflow rate. In addition, numerous second positive system (SPS) excited nitrogen\nmolecules were detected from the OES signals. The intensity of the spectral lines (297.54 nm, 315.76 nm, 336.96 nm, and\n357.56 nm) first increased, then maintained, and then increased rapidly with the increased radius; however, the intensity of the\nspectral lines (380.34 nm, 405.80 nm, and 434.30 nm) basically remained unchanged, then increased, and finally decreased with\nthe increased radius. The vibrational temperature first decreased quickly and then increased and reached the minimum at.................
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